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Annotation of prex-old/include/arm/systrap.h, Revision 1.1.1.1

1.1       nbrk        1: /*
                      2:  * Copyright (c) 2005, Kohsuke Ohtani
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms, with or without
                      6:  * modification, are permitted provided that the following conditions
                      7:  * are met:
                      8:  * 1. Redistributions of source code must retain the above copyright
                      9:  *    notice, this list of conditions and the following disclaimer.
                     10:  * 2. Redistributions in binary form must reproduce the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer in the
                     12:  *    documentation and/or other materials provided with the distribution.
                     13:  * 3. Neither the name of the author nor the names of any co-contributors
                     14:  *    may be used to endorse or promote products derived from this software
                     15:  *    without specific prior written permission.
                     16:  *
                     17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     27:  * SUCH DAMAGE.
                     28:  */
                     29:
                     30: #ifndef _ARM_SYSTRAP_H
                     31: #define _ARM_SYSTRAP_H
                     32:
                     33: #if defined(__gba__)
                     34:
                     35: /*
                     36:  * Note:
                     37:  * GBA BIOS does not allow to an install SWI handler by user. So, the system
                     38:  * calls will jump to the system call entry point (0x200007c) in the kernel
                     39:  * code. Then, the kernel SWI handler will switch the CPU mode to SVC mode.
                     40:  * However, CPU mode can be changed only in privillaged CPU mode. By this
                     41:  * reason, all applications run in SYS mode with GBA.
                     42:  *
                     43:  * FIXME: 0x200007c -> should be defined in somewhere...
                     44:  */
                     45:
                     46: #define SYSCALL0(name) \
                     47:        .global name; .align; \
                     48: name##: \
                     49:        stmfd sp!, {r4, r5, lr}; \
                     50:        mov r4, #SYS_##name; \
                     51:        ldr r5, =0x200007c; \
                     52:        add lr, pc, #2; \
                     53:        mov pc, r5; \
                     54:        ldmfd sp!, {r4, r5, pc};
                     55:
                     56: #else
                     57:
                     58: #define SYSCALL0(name) \
                     59:        .global name; .align; \
                     60: name##: swi #SYS_##name; \
                     61:        mov pc, lr
                     62:
                     63: #endif
                     64:
                     65:
                     66: #define SYSCALL1(name) SYSCALL0(name)
                     67: #define SYSCALL2(name) SYSCALL0(name)
                     68: #define SYSCALL3(name) SYSCALL0(name)
                     69: #define SYSCALL4(name) SYSCALL0(name)
                     70:
                     71: #endif /* _ARM_SYSTRAP_H */